Sorry, I might be wrong but without some citations I just don't believe that.
Side imaging has been around in the salt water community for many years. And not by Humminbird. They certainly do not hold the patent on either the device itself or the idea since both have been around longer than Humminbird has existed. I do believe they probably hold some patents on their particular implementation of SI, but not on the entire concept.
Cudos to Humminbird for getting this to market, but I want to see some competition.
TOm


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